jQuery拖动元素(含代码)

编程语言 12/12 阅读 577 views次 人气 0
摘要:

实现以下目标:

  1.拖动的元素不会拖到外面去(保持始终可见)

  2.兼容IE浏览器,使用流畅

<style type="text/css">
.page{text-align:left;}
.dragDiv{border:1px solid #ddd; padding:10px; width:300px; margin:0 auto; border-radius:4px; box-shadow:0 1px 2px #fefefe; position: fixed;}
</style>
<div class="dragDiv" id="drag">
	<div class="drag-head">点击拖动</div>
	<div class="drag-body">
		哈哈哈哈哈哈哈
	</div>
</div>

jQuery代码:

var _drag = {};
_drag.top = 0; //拖动过的位置距离上边
_drag.left = 0; //拖动过的位置距离左边
_drag.maxLeft; //距离左边最大的距离
_drag.maxTop; //距离上边最大的距离
_drag.dragging = false; //是否拖动标志
//拖动函数
function bindDrag(el){ 
	var winWidth = $(window).width(), winHeight =$(window).height(),objWidth = $(el).outerWidth(), objHeight = $(el).outerHeight();
	_drag.maxLeft = winWidth - objWidth, _drag.maxTop = winHeight - objHeight;
	var els = el.style,x=0,y=0;
	var objTop = $(el).offset().top, objLeft = $(el).offset().left;
	$(el).mousedown(function(e){ 
		_drag.dragging = true;
		_drag.isDragged = true;
		x = e.clientX - el.offsetLeft; 
		y = e.clientY - el.offsetTop; 
		el.setCapture && el.setCapture(); 
		$(document).bind('mousemove',mouseMove).bind('mouseup',mouseUp);
		return false;
	}); 
	function mouseMove(e){ 
		e = e || window.event;
		if(_drag.dragging){
			_drag.top = e.clientY - y; 
			_drag.left = e.clientX - x;
			_drag.top = _drag.top > _drag.maxTop ? _drag.maxTop : _drag.top;
			_drag.left = _drag.left > _drag.maxLeft ? _drag.maxLeft : _drag.left;
			_drag.top = _drag.top < 0 ? 0 : _drag.top;
			_drag.left = _drag.left <0 ? 0 : _drag.left;
			els.top = _drag.top + 'px'; 
			els.left = _drag.left+ 'px';
			return false;
		}

	} 
	function mouseUp(e){ 
		_drag.dragging = false; 
		el.releaseCapture && el.releaseCapture(); 
		e.cancelBubble = true;
		$(document).unbind('mousemove',mouseMove).unbind('mouseup',mouseUp); 
	}
	$(window).resize(function(){
		var winWidth = $(window).width(),
		winHeight = $(window).height(),
		el = $(el),
		elWidth = el.outerWidth(),
		elHeight = el.outerHeight(),
		elLeft = parseFloat(el.css('left')),
		elTop = parseFloat(el.css('top'));
		_drag.maxLeft = winWidth - elWidth;
		_drag.maxTop = winHeight - elHeight;
		_drag.top = _drag.maxTop < elTop ? _drag.maxTop : elTop;
		_drag.left = _drag.maxLeft < elLeft ? _drag.maxLeft : elLeft;
		el.css({
			top:_drag.top,
			left:_drag.left
		})
	})
} 
bindDrag(document.getElementById('drag'));

  

评论

该文章不支持评论!

分享到: